package com.google.gwt.sample.stockwatcher.client;

import java.util.ArrayList;
import java.util.Date;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.KeyCodes;
import com.google.gwt.event.dom.client.KeyPressEvent;
import com.google.gwt.event.dom.client.KeyPressHandler;
import com.google.gwt.i18n.client.DateTimeFormat;
import com.google.gwt.i18n.client.NumberFormat;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.FlexTable;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.SuggestBox;
import com.google.gwt.user.client.ui.VerticalPanel;

public class StockWatcher implements EntryPoint {

  private static final int REFRESH_INTERVAL = 15000; // ms
  private VerticalPanel mainPanel = new VerticalPanel();
  private FlexTable stocksFlexTable = new FlexTable();
  private HorizontalPanel addPanel = new HorizontalPanel();
  //private TextBox newSymbolTextBox = new TextBox();
  private Button addStockButton = new Button("Add");
  private Label lastUpdatedLabel = new Label();
  private SuggestBox newSymbolTextBox;
  private ArrayList<String> stocks = new ArrayList<String>();
  private StockPriceServiceAsync stockPriceSvc = GWT.create(StockPriceService.class);
  //private StockSymbolServiceAsync stockSymbolSvc = GWT.create(StockSymbolService.class);
  /**
   * Entry point method.
   */
  public void onModuleLoad() {
	  	  
    // Create table for stock data.
    stocksFlexTable.setText(0, 0, "Symbol");
    stocksFlexTable.setText(0, 1, "Price");
    stocksFlexTable.setText(0, 2, "Change");
    stocksFlexTable.setText(0, 3, "Remove");
      
    // Add styles to elements in the stock list table.
    stocksFlexTable.setCellPadding(6);
    stocksFlexTable.getRowFormatter().addStyleName(0, "watchListHeader");
    stocksFlexTable.addStyleName("watchList");
    stocksFlexTable.getCellFormatter().addStyleName(0, 1, "watchListNumericColumn");
    stocksFlexTable.getCellFormatter().addStyleName(0, 2, "watchListNumericColumn");
    stocksFlexTable.getCellFormatter().addStyleName(0, 3, "watchListRemoveColumn");

    ItemSuggestOracle oracle = new ItemSuggestOracle(); 
    newSymbolTextBox = new SuggestBox(oracle);
    newSymbolTextBox.setLimit(2);
        
    // Assemble Add Stock panel.
    addPanel.add(newSymbolTextBox);
    addPanel.add(addStockButton);
    addPanel.addStyleName("addPanel");

    // Assemble Main panel.
    mainPanel.add(stocksFlexTable);
    mainPanel.add(addPanel);
    mainPanel.add(lastUpdatedLabel);

    // Associate the Main panel with the HTML host page.
    RootPanel.get("stockList").add(mainPanel);

    // Move cursor focus to the input box.
    newSymbolTextBox.setFocus(true);

    // Listen for mouse events on the Add button.
    addStockButton.addClickHandler(new ClickHandler() {
      public void onClick(ClickEvent event) {
        addStock();
      }
    });

    // Listen for keyboard events in the input box.
    newSymbolTextBox.addKeyPressHandler(new KeyPressHandler() {
      public void onKeyPress(KeyPressEvent event) {
        if (event.getCharCode() == KeyCodes.KEY_ENTER) {
          addStock();
        }
      }
    });
    
  }

  /**
   * Add stock to FlexTable. Executed when the user clicks the addStockButton or
   * presses enter in the newSymbolTextBox.
   */
  private void addStock() {
    final String symbol = newSymbolTextBox.getText().toUpperCase().trim();
    newSymbolTextBox.setFocus(true);
    setupTimerAutoRefresh();
    // Stock code must be between 1 and 10 chars that are numbers, letters, or dots.
    if (!symbol.matches("^[0-9a-zA-Z\\.]{1,10}$")) {
      Window.alert("'" + symbol + "' is not a valid symbol.");
      //newSymbolTextBox.selectAll();
      return;
    }

   // Don't add the stock if it's already in the table.
    if (stocks.contains(symbol))
      return;

    // Add the stock to the table.
    int row = stocksFlexTable.getRowCount();
    stocks.add(symbol);
    stocksFlexTable.setText(row, 0, symbol);
    stocksFlexTable.setWidget(row, 2, new Label());
    stocksFlexTable.getCellFormatter().addStyleName(row, 1, "watchListNumericColumn");
    stocksFlexTable.getCellFormatter().addStyleName(row, 2, "watchListNumericColumn");
    stocksFlexTable.getCellFormatter().addStyleName(row, 3, "watchListRemoveColumn");

    // Add a button to remove this stock from the table.
    Button removeStockButton = new Button("x");
    removeStockButton.addStyleDependentName("remove");
    removeStockButton.addClickHandler(new ClickHandler() {
      public void onClick(ClickEvent event) {
        int removedIndex = stocks.indexOf(symbol);
        stocks.remove(removedIndex);
        stocksFlexTable.removeRow(removedIndex + 1);
      }
    });
    stocksFlexTable.setWidget(row, 3, removeStockButton);

    // Get the stock price.
    refreshWatchList();

  }

  /**
   * Generate stock prices from Nasdaq
   */
  private void refreshWatchList() { // Initialize the service proxy.
	    if (stockPriceSvc == null) {
	        stockPriceSvc = GWT.create(StockPriceService.class);
	      }

	      // Set up the callback object.
	      AsyncCallback<StockPrice[]> callback = new AsyncCallback<StockPrice[]>() {
	        public void onFailure(Throwable caught) {
	          // TODO: Do something with errors.
	        }

			@Override
			public void onSuccess(StockPrice[] prices) {
				for (int i = 0; i < prices.length; i++) {
				      updateTable(prices[i]);
				    }

				    // Display timestamp showing last refresh.
				    lastUpdatedLabel.setText("Last update : "
				        + DateTimeFormat.getMediumDateTimeFormat().format(new Date()));			
			}
	      };

	      // Make the call to the stock price service.
	      stockPriceSvc.getPrices(stocks.toArray(new String[0]), callback);
	      
  }	      

  /**
   * Update a single row in the stock table.
   *
   * @param price Stock data for a single row.
   */
  private void updateTable(StockPrice price) {
    // Make sure the stock is still in the stock table.
    if (!stocks.contains(price.getSymbol().trim())) {    	
    	System.out.println("inside");
    	return;
    }
    System.out.println("outside");
    int row = stocks.indexOf(price.getSymbol().trim()) + 1;
    System.out.println("row: "+row);

    // Format the data in the Price and Change fields.
    String priceText = NumberFormat.getFormat("#,##0.00").format(
        price.getPrice());
    
    NumberFormat changeFormat = NumberFormat.getFormat("+#,##0.00;-#,##0.00");
    String changeText = changeFormat.format(price.getChange());
    System.out.println("change Text: "+changeText);
    String changePercentText = changeFormat.format(price.getChangePercent());
    System.out.println("change% Text: "+changeText);

    // Populate the Price and Change fields with new data.
    stocksFlexTable.setText(row, 1, priceText);
    Label changeWidget = (Label)stocksFlexTable.getWidget(row, 2);
    changeWidget.setText(changeText + " (" + changePercentText + "%)");

    // Change the color of text in the Change field based on its value.
    String changeStyleName = "noChange";
    if (price.getChangePercent() < -0.1f) {
      changeStyleName = "negativeChange";
    }
    else if (price.getChangePercent() > 0.1f) {
      changeStyleName = "positiveChange";
    }

    changeWidget.setStyleName(changeStyleName);
  }
  
  private void setupTimerAutoRefresh(){
	  // Setup timer to refresh list automatically.
	    Timer refreshTimer = new Timer() {
	      @Override
	      public void run() {
	        refreshWatchList();
	      }
	    };
	    refreshTimer.scheduleRepeating(REFRESH_INTERVAL);
  }
}

